Guests can view your wishlist and reserve a gift on it. They can't add, edit, or delete wishes, and they can't change any of your settings.
What a guest can see
The wishlist name, description, and images.
Each wish: name, price, images, notes, store link, tags, availability, and priority.
Whether a wish is already reserved, so two people don't claim the same gift.
What a guest can do
Reserve a gift, which marks it as taken so another guest doesn't buy the same thing. Reserving is a claim, not a purchase, and Wishpicks doesn't handle the payment. See "How does gift reservation work?"
They can also tap through to the store link and buy the item there.
What a guest cannot do
Guests can't add, edit, delete, or reorder wishes, rename the wishlist, or change any of its settings.
Good to know
Editing is a separate role you hand out by email, so people who only have the link never get edit access. See "What's the difference between an editor, a guest, and someone reserving a gift?"
Reserving stays a surprise by default. You won't even see that a gift was claimed unless you turn on Reveal reservations. See "How do I make sure my friends can reserve a gift?"